Ca、Sr复合添加对AZ91镁合金组织与耐腐蚀性能的影响

doi:10.11896/cldb.24100108

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Abstract Magnesium alloys have a wide range of applications in shell and bracket parts due to their lightweight properties and excellent mechanical properties. However, the electrochemical activity of magnesium alloys is relatively high, and the corrosion product film is porous and loose, which significantly influences the service performance of the components. In this study, AZ91 magnesium alloy was employed as the research object to examine the impact of combined additions of Ca (0.1%) and varying contents of Sr (0%, 0.05%, 0.15%, 0.25%) on the alloy microstructure and corrosion resistance. The results show that when 0.1Ca and 0.15Sr are combined, the alloy exhibits the most uniform and refined microstructure, and the optimal corrosion resistance with a self-corrosion potential of -1.484 V. As the Sr content increases, the rose-like microstructure of the alloy is refined, and the content of Mg₁₇Al₁₂ in the microstructure is observed to decrease. Conversely, the concentrations of the Al₄Sr and Al₂ Ca phases demonstrate a significant increase at 0.25% Sr. In the high Sr content, the semi-continuous cathodic phase Mg₁₇Al₁₂ is gradually blocked by the Al₄Sr and Al₂Ca phases at the solidification interface front, this results in the formation of additional corrosion channels between these phases, leading to a decrease in the corrosion resistance of the alloy. The addition of an appropriate Sr (0.15%) element gene-rates a minimal quantity of both Al₄Sr and Al₂ Ca cathodic phases, which do not markedly change the distribution of the Mg₁₇Al₁₂ phases, and significantly refines the alloy microstructure, resulting in more uniform and slower corrosion, thereby enhancing the corrosion resistance of the alloy. Furthermore, an in-depth analysis of the corrosion mechanism of the alloy with the combined addition of Ca and Sr was conducted.

Key words： Ca,Sr microalloying AZ91 cathodic phase corrosion mechanism

Published: Online: 2025-10-27

CLC number:

TG17

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	Articles by authors
	WU Shuang
	HU Ping
	LIU Wenjun
	GAO Xueqin
	WANG Weiqing
	SONG Jingfeng
	WANG Hui
	JIANG Bin

Cite this article:

WU Shuang,HU Ping,LIU Wenjun, et al. Effect of Ca,Sr Composite Addition on Microstructure and Corrosion Resistance of AZ91 Magnesium Alloy[J]. Materials Reports, 2025, 39(20): 24100108-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24100108 OR https://www.mater-rep.com/EN/Y2025/V39/I20/24100108

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